The Boylestad & Nashelsky 10th Edition solutions manual is the best $20-$40 (or free library resource) you will invest in during your second year of engineering. When used correctly, it turns a frustrating wall of text into a manageable, logical science.
Detailed focus on Bipolar Junction Transistors (BJTs) and Field-Effect Transistors (FETs), including DC biasing, AC small-signal models, and amplifier configurations. Operational Amplifiers (Op-Amps): The Boylestad & Nashelsky 10th Edition solutions manual